Valentin Vladut - Academia.edu (original) (raw)

Papers by Valentin Vladut

Jerusalem artichoke (Helianthus tuberosusL.) is a perennial plant whose tubers containinulin,whic... more Jerusalem artichoke (Helianthus tuberosusL.) is a perennial plant whose tubers containinulin,which can be used as raw material for healthy products, sweeteners, bioethanol and animal feed. The objective of this paper is o present some consideration about this very important plant for agriculture, medicine, food and health

The oil obtained from oil plants have characteristics and properties that allow use for people fo... more The oil obtained from oil plants have characteristics and properties that allow use for people food, animals and in some cases alternative fuel engines. Camelina is an oil plant that has properties superior to other known plants: sunflower, soybean, flax, etc., to be used as fuel, the paper presenting some considerations that make this plant as an alternative to fossil fuels

Annals of the University of Craiova - Agriculture, Montanology, Cadastre Series, 2019

An na al le el le e U Un ni iv ve er rs si it tă ăţ ţi ii i d di in n C Cr ra ai io ov va a, , s ... more An na al le el le e U Un ni iv ve er rs si it tă ăţ ţi ii i d di in n C Cr ra ai io ov va a, , s se er ri ia a A Ag gr ri ic cu ul lt tu ur ră ă-M Mo on nt ta an no ol lo og gi ie e-C Ca ad da as st tr ru u ((A An nn na al ls s o of f t th he e U Un ni iv ve er rs si it ty y o of f C Cr ra ai io ov va a-A Ag gr ri ic cu ul lt tu ur re e, , M Mo on nt ta an no ol lo og gy y, , C Ca ad da as st tr re e S Se er ri ie es s)) V Vo ol l.. X

In the process of fibrous forage harvesting, an important requirement is the proper shredding, be... more In the process of fibrous forage harvesting, an important requirement is the proper shredding, because it enters directly or indirectly the animal feed composition, whether it is about of fresh fibrous feed with a high degree of moisture or it is about of withered feed, in some cases even dried fodder. It is known that the energetic contribution to achieve of a cut differs within large limits, depending on many factors. For reducing the energy consumption during the shredding of fibrous fodder to minimum possible, we must know the mechanism of cutting process, which also ensures the harvesting equipment reliability.

The large variety of phyto-sanitary equipment and plants existing on the Romanian market (various... more The large variety of phyto-sanitary equipment and plants existing on the Romanian market (various brands, various levels of wear), the users’ training level and the requirements Romania had for its accession to the EU demand the adoption of some precise regulations concerning the control of the spraying equipment according to the present-day international norms. This paper presents the spraying testing equipments in INMA Bucharest, using the specifically modern equipments, which let the checking respect of the European norms from domain. The tests looking the verification of requirements from SR EN 13790 for plants protection machines have pursued: the determination of transversal distribution uniformity on the test bench for spraying machines in the base crops; the determination of distribution uniformity on the test bench for spraying machines in vineyards an orchards; the determination of nozzle flow and of flow coefficient; the determination of pressure drop. The paper refers it...

INMATEH-Agricultural Engineering, 2014

This article presents the role and mathematical modeling importance in research and development o... more This article presents the role and mathematical modeling importance in research and development of experimental plan. Although the results presented refer only to the field of biology, the presented method is valid for any field of activity. The results refer to research about bioaccumulation of heavy metals in plants. It is exposed how the mathematical modeling of the phenomenon, even under the most elementary form, suggests the basics of the experimental plan. The experiments performing, taking into account the mathematical models suggestions, lead to the correction and the development of mathematical models. These will be able to give new predictions and utilities.

Revista de Chimie, 2019

The main aim of this study was to establish the optimum dose of Jerusalem artichoke (Helianthus t... more The main aim of this study was to establish the optimum dose of Jerusalem artichoke (Helianthus tuberosus L.) flour to be used as a functional ingredient in the bakery products industry, from both a nutritional and technological point of view. H. tuberosus has an important functional potential given by its high content of inulin, minerals, amino acids, and organic silicon. In this work, H. tuberosus flour was used for the enrichment of wheat flour with functional biocompounds. The experiments evaluated the functional potential of wheat flour enriched with H. tuberosus flour, in different proportions, by examining the chemical composition and rheological behaviour of the doughs. It was found that incorporation up to a 5% into the formulation of wheat flour yielded an acceptable product in terms of rheological parameters, with improved nutritional and functional properties.

Jerusalem artichoke (Helianthus tuberosusL.) is not cultivated on the large surface that cereals,... more Jerusalem artichoke (Helianthus tuberosusL.) is not cultivated on the large surface that cereals, vegetables or potatoes so mechanizes technologies are not very often encountered. In this paper are presented few technologies used on the country where this culture occupied large surface and not only

E3S Web of Conferences, 2021

Biological water filtration is a process by which toxic compounds are removed from water using or... more Biological water filtration is a process by which toxic compounds are removed from water using organisms. A well-sized biological filter is extremely important as part of a recirculating aquaculture system for fish farming. Biological water filtration equipment in aquaculture recycling systems is a technological set that restores the vital qualities of wastewater from fish ponds, thus allowing its reuse

The paper presents some aspects regarding the utilization of certain ecological substances as an ... more The paper presents some aspects regarding the utilization of certain ecological substances as an alternative to environmental-friendly insecticides, in order to obtain some ecological products within the context of the increased concern for ecological products.

Erwerbs-Obstbau, 2015

In this study, strength and frictional properties of pecan was determined as a functional of mois... more In this study, strength and frictional properties of pecan was determined as a functional of moisture content. A pecan was loaded between two parallel plates to determine the rupture force, deformation, power and firmness required to initiate pecan rupture and determined static and dynamic friction. The tests were carried out at five moisture contents of 5.23 %, 10.36 %, 15.78 %, 20.08 % and 25.42 % db and three axes (X, Y, Z). Physical characteristics of the pecan such as mass, dimensions (length, thickness and width), geometric mean diameter, sphericity, volume, and shell thickness were determined. The force required to initiate nut rupture decreased from 112.321 to 98.723 N, from 82.872 to 63,988 N and from 80.093 to 62.758 N for the length, suture and width orientations of loading with an increase in moisture content. The highest toughness (20.460 Jmm− 3) was obtained at moisture content of 25.42 % db. The firmness decreased to a minimum value when moisture content was increased from 5.23 to 10.36 % db and later increased as moisture content was increased further from 10.36 to 25.42 % db. The static and dynamic coefficients of friction on various surfaces, namely, plywood, mild steel and galvanized metal also increased linearly with increase in moisture content. The plywood surface offered the maximum friction followed by mild metal and galvanized metal.ZusammenfassungIn dieser Studie wurden die Festigkeit und die Reibungskräfte der Pekannuss in Abhängigkeit vom Feuchtegehalt der Frucht bestimmt. Eine Pekannuss wurde zwischen zwei parallele Platten eingespannt, um die erforderliche Bruchstärke, Verformung, Kraft und Festigkeit festzustellen, die den Knackprozess einleiten und es wurde die Haft- und Bewegungsreibung bestimmt. Die Versuche wurden bei 5 Feuchtegehalten (5.23 %, 10.36 %, 15.78 %, 20.08 % und 25.42 % – jeweils bezogen auf die Trockenmasse) durchgeführt und mit Hilfe von einem 3-Achsensystem (X, Y, Z) ausgewertet. Die physikalischen Eigenschaften der Pekannuss wie Gewicht, Abmessungen (Länge, Dicke und Breite), das geometrische Mittel des Durchmessers, die Kugeligkeit, die Größe und die Schalendicke wurden bestimmt. Die Kraft, die benötigt wurde, um das Knacken der Nüsse einzuleiten, verminderte sich bei einer Erhöhung des Feuchtegehaltes von 112.321 auf 98.723 N, von 82.872 auf 63.988 N und von 80.093 auf 62.758 N, je nachdem, ob sie mit der Länge, auf der Nussnaht oder der Breite eingespannt wurden. Die höchste Bruchzähigkeit (20.460 Jmm− 3) wurde bei einem Feuchtegehalt mit 25.42 % erreicht. Die Härte verminderte sich bis zu einem Minimalwert bei zunehmendem Feuchtegehalt von 5.23 % auf 10.36 % und stieg später wieder an, wenn der Feuchtegehalt von 10.36 % auf 25.42 % weiter anstieg. Die Haft- und Bewegungskoeffizienten der Reibung bei unterschiedlichen Oberflächen, und zwar bei Sperrholz, Baustahl und verzinktem Metall, stiegen mit dem Feuchtegehalt linear an. Die Sperrholz-Oberfläche lieferte die höchste Reibung, gefolgt von Baustahl und verzinktem Metall.

RURAL DEVELOPMENT 2019, 2022

Mechanical continuous presses are the most commonly used machines for the pressing of oleaginous ... more Mechanical continuous presses are the most commonly used machines for the pressing of oleaginous materials in oil industry. This paper contains a theoretical model regarding the power necessary to operate an oil press. The necessary components to power the press are: the power needed to transport the material along the pressing chamber, the power required to press the oleaginous material, the power needed to overcome the friction between the screw spire and the material, the power needed to push the material from the press through the exhaust cylinder head.

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture, 2010

Solar energy represents one of the future energy sources with a high potential, used as an altern... more Solar energy represents one of the future energy sources with a high potential, used as an alternative to conventional methods, especially during summer. The advantages of using solar energy are multiple, this type of energy being virtually endless and free, and its use has no negative effects on the environment, being regarded as a clean energy source. Solar energy has multiple applications in agriculture, one of its benefits being that it is used for dryers as an alternative energy source, especially in regions with a high solar potential. In this paper different types of fruits and vegetable dryers, nationally and abroad are presented, as well as results obtained from different methods of solar dryers.

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture, 2010

Solar radiation represents an inexhaustible and unexploited energy resource in Romania and intern... more Solar radiation represents an inexhaustible and unexploited energy resource in Romania and internationally. At present time, in which the energy issue grows in importance, and environment protection became a society demand, efforts in unconventional energy technologies development (solar, wind, geothermal, etc.). Many sectors rely on sun technology benefit, and so can agriculture. The productivity of these sectors depends on the amount of energy that they gather from the sun. Generally there are two types of solar systems: the ones that convert solar energy into electricity and the others that convert solar energy into heat. Both types have many applications in agriculture, helping the productivity. Photovoltaic panels are very economy efficient regarding electricity distribution for long distance locations, like agricultural exploitations, farms, orchards, and other agricultural operations. The use of solar panels is indicated for agriculture due to easy maintenance. Farmers don’t ...

Jerusalem artichoke (Helianthus tuberosusL.) is a perennial plant whose tubers containinulin,whic... more Jerusalem artichoke (Helianthus tuberosusL.) is a perennial plant whose tubers containinulin,which can be used as raw material for healthy products, sweeteners, bioethanol and animal feed. The objective of this paper is o present some consideration about this very important plant for agriculture, medicine, food and health

The oil obtained from oil plants have characteristics and properties that allow use for people fo... more The oil obtained from oil plants have characteristics and properties that allow use for people food, animals and in some cases alternative fuel engines. Camelina is an oil plant that has properties superior to other known plants: sunflower, soybean, flax, etc., to be used as fuel, the paper presenting some considerations that make this plant as an alternative to fossil fuels

Annals of the University of Craiova - Agriculture, Montanology, Cadastre Series, 2019

An na al le el le e U Un ni iv ve er rs si it tă ăţ ţi ii i d di in n C Cr ra ai io ov va a, , s ... more An na al le el le e U Un ni iv ve er rs si it tă ăţ ţi ii i d di in n C Cr ra ai io ov va a, , s se er ri ia a A Ag gr ri ic cu ul lt tu ur ră ă-M Mo on nt ta an no ol lo og gi ie e-C Ca ad da as st tr ru u ((A An nn na al ls s o of f t th he e U Un ni iv ve er rs si it ty y o of f C Cr ra ai io ov va a-A Ag gr ri ic cu ul lt tu ur re e, , M Mo on nt ta an no ol lo og gy y, , C Ca ad da as st tr re e S Se er ri ie es s)) V Vo ol l.. X

In the process of fibrous forage harvesting, an important requirement is the proper shredding, be... more In the process of fibrous forage harvesting, an important requirement is the proper shredding, because it enters directly or indirectly the animal feed composition, whether it is about of fresh fibrous feed with a high degree of moisture or it is about of withered feed, in some cases even dried fodder. It is known that the energetic contribution to achieve of a cut differs within large limits, depending on many factors. For reducing the energy consumption during the shredding of fibrous fodder to minimum possible, we must know the mechanism of cutting process, which also ensures the harvesting equipment reliability.

The large variety of phyto-sanitary equipment and plants existing on the Romanian market (various... more The large variety of phyto-sanitary equipment and plants existing on the Romanian market (various brands, various levels of wear), the users’ training level and the requirements Romania had for its accession to the EU demand the adoption of some precise regulations concerning the control of the spraying equipment according to the present-day international norms. This paper presents the spraying testing equipments in INMA Bucharest, using the specifically modern equipments, which let the checking respect of the European norms from domain. The tests looking the verification of requirements from SR EN 13790 for plants protection machines have pursued: the determination of transversal distribution uniformity on the test bench for spraying machines in the base crops; the determination of distribution uniformity on the test bench for spraying machines in vineyards an orchards; the determination of nozzle flow and of flow coefficient; the determination of pressure drop. The paper refers it...

INMATEH-Agricultural Engineering, 2014

This article presents the role and mathematical modeling importance in research and development o... more This article presents the role and mathematical modeling importance in research and development of experimental plan. Although the results presented refer only to the field of biology, the presented method is valid for any field of activity. The results refer to research about bioaccumulation of heavy metals in plants. It is exposed how the mathematical modeling of the phenomenon, even under the most elementary form, suggests the basics of the experimental plan. The experiments performing, taking into account the mathematical models suggestions, lead to the correction and the development of mathematical models. These will be able to give new predictions and utilities.

Revista de Chimie, 2019

The main aim of this study was to establish the optimum dose of Jerusalem artichoke (Helianthus t... more The main aim of this study was to establish the optimum dose of Jerusalem artichoke (Helianthus tuberosus L.) flour to be used as a functional ingredient in the bakery products industry, from both a nutritional and technological point of view. H. tuberosus has an important functional potential given by its high content of inulin, minerals, amino acids, and organic silicon. In this work, H. tuberosus flour was used for the enrichment of wheat flour with functional biocompounds. The experiments evaluated the functional potential of wheat flour enriched with H. tuberosus flour, in different proportions, by examining the chemical composition and rheological behaviour of the doughs. It was found that incorporation up to a 5% into the formulation of wheat flour yielded an acceptable product in terms of rheological parameters, with improved nutritional and functional properties.

Jerusalem artichoke (Helianthus tuberosusL.) is not cultivated on the large surface that cereals,... more Jerusalem artichoke (Helianthus tuberosusL.) is not cultivated on the large surface that cereals, vegetables or potatoes so mechanizes technologies are not very often encountered. In this paper are presented few technologies used on the country where this culture occupied large surface and not only

E3S Web of Conferences, 2021

Biological water filtration is a process by which toxic compounds are removed from water using or... more Biological water filtration is a process by which toxic compounds are removed from water using organisms. A well-sized biological filter is extremely important as part of a recirculating aquaculture system for fish farming. Biological water filtration equipment in aquaculture recycling systems is a technological set that restores the vital qualities of wastewater from fish ponds, thus allowing its reuse

The paper presents some aspects regarding the utilization of certain ecological substances as an ... more The paper presents some aspects regarding the utilization of certain ecological substances as an alternative to environmental-friendly insecticides, in order to obtain some ecological products within the context of the increased concern for ecological products.

Erwerbs-Obstbau, 2015

In this study, strength and frictional properties of pecan was determined as a functional of mois... more In this study, strength and frictional properties of pecan was determined as a functional of moisture content. A pecan was loaded between two parallel plates to determine the rupture force, deformation, power and firmness required to initiate pecan rupture and determined static and dynamic friction. The tests were carried out at five moisture contents of 5.23 %, 10.36 %, 15.78 %, 20.08 % and 25.42 % db and three axes (X, Y, Z). Physical characteristics of the pecan such as mass, dimensions (length, thickness and width), geometric mean diameter, sphericity, volume, and shell thickness were determined. The force required to initiate nut rupture decreased from 112.321 to 98.723 N, from 82.872 to 63,988 N and from 80.093 to 62.758 N for the length, suture and width orientations of loading with an increase in moisture content. The highest toughness (20.460 Jmm− 3) was obtained at moisture content of 25.42 % db. The firmness decreased to a minimum value when moisture content was increased from 5.23 to 10.36 % db and later increased as moisture content was increased further from 10.36 to 25.42 % db. The static and dynamic coefficients of friction on various surfaces, namely, plywood, mild steel and galvanized metal also increased linearly with increase in moisture content. The plywood surface offered the maximum friction followed by mild metal and galvanized metal.ZusammenfassungIn dieser Studie wurden die Festigkeit und die Reibungskräfte der Pekannuss in Abhängigkeit vom Feuchtegehalt der Frucht bestimmt. Eine Pekannuss wurde zwischen zwei parallele Platten eingespannt, um die erforderliche Bruchstärke, Verformung, Kraft und Festigkeit festzustellen, die den Knackprozess einleiten und es wurde die Haft- und Bewegungsreibung bestimmt. Die Versuche wurden bei 5 Feuchtegehalten (5.23 %, 10.36 %, 15.78 %, 20.08 % und 25.42 % – jeweils bezogen auf die Trockenmasse) durchgeführt und mit Hilfe von einem 3-Achsensystem (X, Y, Z) ausgewertet. Die physikalischen Eigenschaften der Pekannuss wie Gewicht, Abmessungen (Länge, Dicke und Breite), das geometrische Mittel des Durchmessers, die Kugeligkeit, die Größe und die Schalendicke wurden bestimmt. Die Kraft, die benötigt wurde, um das Knacken der Nüsse einzuleiten, verminderte sich bei einer Erhöhung des Feuchtegehaltes von 112.321 auf 98.723 N, von 82.872 auf 63.988 N und von 80.093 auf 62.758 N, je nachdem, ob sie mit der Länge, auf der Nussnaht oder der Breite eingespannt wurden. Die höchste Bruchzähigkeit (20.460 Jmm− 3) wurde bei einem Feuchtegehalt mit 25.42 % erreicht. Die Härte verminderte sich bis zu einem Minimalwert bei zunehmendem Feuchtegehalt von 5.23 % auf 10.36 % und stieg später wieder an, wenn der Feuchtegehalt von 10.36 % auf 25.42 % weiter anstieg. Die Haft- und Bewegungskoeffizienten der Reibung bei unterschiedlichen Oberflächen, und zwar bei Sperrholz, Baustahl und verzinktem Metall, stiegen mit dem Feuchtegehalt linear an. Die Sperrholz-Oberfläche lieferte die höchste Reibung, gefolgt von Baustahl und verzinktem Metall.

RURAL DEVELOPMENT 2019, 2022

Mechanical continuous presses are the most commonly used machines for the pressing of oleaginous ... more Mechanical continuous presses are the most commonly used machines for the pressing of oleaginous materials in oil industry. This paper contains a theoretical model regarding the power necessary to operate an oil press. The necessary components to power the press are: the power needed to transport the material along the pressing chamber, the power required to press the oleaginous material, the power needed to overcome the friction between the screw spire and the material, the power needed to push the material from the press through the exhaust cylinder head.

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture, 2010

Solar energy represents one of the future energy sources with a high potential, used as an altern... more Solar energy represents one of the future energy sources with a high potential, used as an alternative to conventional methods, especially during summer. The advantages of using solar energy are multiple, this type of energy being virtually endless and free, and its use has no negative effects on the environment, being regarded as a clean energy source. Solar energy has multiple applications in agriculture, one of its benefits being that it is used for dryers as an alternative energy source, especially in regions with a high solar potential. In this paper different types of fruits and vegetable dryers, nationally and abroad are presented, as well as results obtained from different methods of solar dryers.

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture, 2010

Solar radiation represents an inexhaustible and unexploited energy resource in Romania and intern... more Solar radiation represents an inexhaustible and unexploited energy resource in Romania and internationally. At present time, in which the energy issue grows in importance, and environment protection became a society demand, efforts in unconventional energy technologies development (solar, wind, geothermal, etc.). Many sectors rely on sun technology benefit, and so can agriculture. The productivity of these sectors depends on the amount of energy that they gather from the sun. Generally there are two types of solar systems: the ones that convert solar energy into electricity and the others that convert solar energy into heat. Both types have many applications in agriculture, helping the productivity. Photovoltaic panels are very economy efficient regarding electricity distribution for long distance locations, like agricultural exploitations, farms, orchards, and other agricultural operations. The use of solar panels is indicated for agriculture due to easy maintenance. Farmers don’t ...